DIRECTORY

Atom, GGBasicTypes, GGBoundBox, GGCircles, GGError, GGLines, GGSlice, GGInterfaceTypes, GGModelTypes, GGObjects, GGShapes, GGParseOut, GGParseIn, GGTransform, GGUtility, GGVector, Imager, ImagerTransformation, ImagerColor, IO, NodeStyle, RealFns, Rope, ViewerClasses;

GGSliceImplA: CEDAR PROGRAM
IMPORTS Atom, GGBoundBox, GGCircles, GGError, GGLines, GGObjects, GGSlice, GGParseIn, GGParseOut, GGShapes, GGTransform, GGVector, Imager, IO, RealFns, ImagerTransformation, Rope EXPORTS GGSlice = BEGIN

Scene: TYPE = GGModelTypes.Scene;
BoundBox: TYPE = GGModelTypes.BoundBox;
CameraData: TYPE = GGInterfaceTypes.CameraData;
Circle: TYPE = GGBasicTypes.Circle;
Corner: TYPE = GGSlice.Corner;
DisplayStyle: TYPE = GGSlice.DisplayStyle;
Edge: TYPE = GGBasicTypes.Edge;
ExtendMode: TYPE = GGModelTypes.ExtendMode;
Line: TYPE = GGBasicTypes.Line;
Point: TYPE = GGBasicTypes.Point;
PointGenerator: TYPE = GGModelTypes.PointGenerator;
PointGeneratorObj: TYPE = GGModelTypes.PointGeneratorObj;
PointPairGenerator: TYPE = GGModelTypes.PointPairGenerator;
PointPairGeneratorObj: TYPE = GGModelTypes.PointPairGeneratorObj;
SelectedObjectData: TYPE = GGModelTypes.SelectedObjectData;
SelectionClass: TYPE = GGInterfaceTypes.SelectionClass;
SelectMode: TYPE = GGModelTypes.SelectMode;
Slice: TYPE = GGModelTypes.Slice;
SliceClass: TYPE = GGModelTypes.SliceClass;
SliceClassObj: TYPE = GGModelTypes.SliceClassObj;
SliceDescriptor: TYPE = GGModelTypes.SliceDescriptor;
SliceDescriptorObj: TYPE = GGModelTypes.SliceDescriptorObj;
SliceObj: TYPE = GGModelTypes.SliceObj;
SliceParts: TYPE = GGModelTypes.SliceParts;
Viewer: TYPE = ViewerClasses.Viewer;
Vector: TYPE = GGBasicTypes.Vector;

SliceClassDef: TYPE = REF SliceClassDefObj;
SliceClassDefObj: TYPE = RECORD[type: ATOM, class: SliceClass];

BoxData: TYPE = REF BoxDataObj;
BoxDataObj: TYPE = RECORD [
box: BoundBox, -- this is not used as a bounding box.  It is a representation of the shape.
tightBox: BoundBox, -- a Manhattan aligned box, that contains this box.  tightBox does NOT allow for stroke width or control points.
transform: ImagerTransformation.Transformation,
inverse: ImagerTransformation.Transformation, -- inverse of transform
inverseScale: Vector, -- cached value of ImagerTransformation.Factor[inverse].s
strokeWidths: ARRAY [0..4) OF REAL, -- in order left, top, right, bottom
strokeColors: ARRAY [0..4) OF Imager.Color, -- in order left, top, right, bottom
fillColor: Imager.Color
];

CornerArray: TYPE = ARRAY [0..4) OF BOOL; -- ll, ul, ur, lr. Clockwise order of corners.
EdgeArray: TYPE = ARRAY [0..4) OF BOOL; -- left, top, right, bottom. Clockwise order of edges.

BoxParts: TYPE = REF BoxPartsObj;
BoxPartsObj: TYPE = RECORD [
corners: CornerArray, -- which corners of box are selected.
edges: EdgeArray, -- which edges of box are selected.
center: BOOL -- is the middle joint selected?
];
BoxHitData: TYPE = REF BoxHitDataObj;
BoxHitDataObj: TYPE = RECORD [
corner: [-1..3],
edge: [-1..3],
center: [-1..0],
hitPoint: Point
];

BuildBoxSliceClass: PUBLIC PROC [] RETURNS [class: SliceClass] = {
OPEN GGSlice;
class _ NEW[SliceClassObj _ [
type: $Box,
getBoundBox: BoxGetBoundBox,
getTightBox: BoxGetTightBox,
copy: BoxCopy,
drawParts: BoxDrawParts,
drawTransform: BoxDrawTransform,
drawSelectionFeedback: BoxDrawSelectionFeedback,
drawAttractorFeedback: NoOpDrawAttractorFeedback,
transform: BoxTransform,
describe: BoxDescribe,
fileout: BoxFileout,
filein: BoxFilein,
emptyParts: BoxEmptyParts,
newParts: BoxNewParts,
unionParts: BoxUnionParts,
differenceParts: BoxDiffParts,
movingParts: BoxMovingParts,
fixedParts: BoxFixedParts,
augmentParts: BoxAugmentParts,
pointsInDescriptor: BoxPointsInDescriptor,
pointPairsInDescriptor: BoxPointPairsInDescriptor,
nextPoint: BoxNextPoint,
nextPointPair: BoxNextPointPair,
closestPoint: BoxClosestPoint,
closestPointAndTangent: NoOpClosestPointAndTangent,
closestSegment: BoxClosestSegment,
lineIntersection: BoxLineIntersection,
circleIntersection: NoOpCircleIntersection,
hitDataAsSimpleCurve: BoxHitDataAsSimpleCurve,
setStrokeWidth: BoxSetStrokeWidth,
getStrokeWidth: BoxGetStrokeWidth,
setStrokeColor: BoxSetStrokeColor,
getStrokeColor: BoxGetStrokeColor,
setFillColor: BoxSetFillColor,
getFillColor: BoxGetFillColor
]];
};


MakeBoxSlice: PUBLIC PROC [box: BoundBox, corner: Corner, transform: ImagerTransformation.Transformation _ GGTransform.Identity[], strokeWidth: REAL _ 2.0] RETURNS [sliceD: SliceDescriptor] = {
boxSlice: Slice;
inverse: ImagerTransformation.Transformation _ ImagerTransformation.Invert[transform];
boxData: BoxData _ NEW[BoxDataObj _ [box: box, tightBox: GGBoundBox.NullBoundBox[], transform: transform, inverse: inverse, inverseScale: ImagerTransformation.Factor[inverse].s, strokeWidths: [strokeWidth, strokeWidth, strokeWidth, strokeWidth], strokeColors: [Imager.black, Imager.black, Imager.black, Imager.black], fillColor: NIL] ];
boxParts: BoxParts _ NEW[BoxPartsObj _ [corners: ALL[FALSE], edges: ALL[FALSE], center: FALSE] ];
cIndex: INTEGER _ SELECT corner FROM ll=>0, ul=>1, ur=>2, lr=>3,ENDCASE=>2;
boxParts.corners[cIndex] _ TRUE;
IF box.loX > box.hiX THEN {t: REAL _ box.loX; box.loX _ box.hiX; box.hiX _ t};
IF box.loY > box.hiY THEN {t: REAL _ box.loY; box.loY _ box.hiY; box.hiY _ t};
boxSlice _ NEW[SliceObj _ [
class: FetchSliceClass[$Box],
data: boxData,
parent: NIL,
selectedInFull: [FALSE, FALSE, FALSE],
boundBox: GGBoundBox.NullBoundBox[]
]];
BoxSetBoundBox[boxSlice];
sliceD _ NEW[SliceDescriptorObj _ [boxSlice, boxParts] ];
};

BoxMaxStrokeWidth: PROC [boxData: BoxData] RETURNS [maxWidth: REAL] = {
maxWidth _ boxData.strokeWidths[0];
FOR i: NAT IN [1..3] DO
IF boxData.strokeWidths[i] > maxWidth THEN maxWidth _ boxData.strokeWidths[i];
ENDLOOP;
};

BoxSetBoundBox: PROC [slice: Slice] = {
cpHalf: REAL _ GGModelTypes.halfJointSize + 1;
strokeWidth: REAL _ BoxMaxStrokeWidth[NARROW[slice.data]];
pad: REAL _ MAX[cpHalf, strokeWidth];
boxData: BoxData _ NARROW[slice.data];
GGBoundBox.UpdateBoundBoxOfBoundBox[boxData.tightBox, boxData.box, boxData.transform];
GGBoundBox.UpdateCopyBoundBox[bBox: slice.boundBox, from: boxData.tightBox];
GGBoundBox.EnlargeByOffset[slice.boundBox, pad];
};

BoxGetBoundBox: PROC [slice: Slice, parts: SliceParts] RETURNS [box: BoundBox] = {
RETURN[slice.boundBox];
};

BoxGetTightBox: PROC [slice: Slice, parts: SliceParts] RETURNS [box: BoundBox] = {
boxData: BoxData _ NARROW[slice.data];
RETURN[boxData.box];
};

BoxCopy: PROC [slice: Slice] RETURNS [copy: Slice] = {
copyData: BoxData;
boxData: BoxData _ NARROW[slice.data];
box: BoundBox _ GGBoundBox.CopyBoundBox[boxData.box];
transform: Imager.Transformation _ ImagerTransformation.Copy[boxData.transform];
copy _ MakeBoxSlice[box, ur, transform].slice; -- does ur work here ??
copyData _ NARROW[copy.data];
FOR i: NAT IN [0..4) DO 
copyData.strokeWidths[i] _ boxData.strokeWidths[i];
copyData.strokeColors[i] _ boxData.strokeColors[i];
ENDLOOP;
copyData.fillColor _ boxData.fillColor;
};

BoxDrawParts: PROC [slice: Slice, parts: SliceParts, dc: Imager.Context, camera: CameraData, quick: BOOL] = {
DoBoxDrawParts: PROC = {
IF parts = NIL OR IsComplete[parts] THEN BoxDrawAll[dc, boxData, [boxData.box.loX, boxData.box.loY], [boxData.box.hiX, boxData.box.hiY], camera]
ELSE {
BoxPathProc: Imager.PathProc = { moveTo[pts[0]]; lineTo[pts[1]]; lineTo[pts[2]]; lineTo[pts[3]]; };
BoxEdgeDraw: PROC [index: INTEGER, p1, p2: Point] = {
IF boxData.strokeColors[index]=NIL OR boxData.strokeWidths[index]=0.0 THEN RETURN;
Imager.SetStrokeWidth[dc, boxData.strokeWidths[index] ];
Imager.SetColor[dc, boxData.strokeColors[index] ];
Imager.MaskVector[dc, p1, p2];
};
boxParts: BoxParts _ NARROW[parts];
t: ImagerTransformation.Transformation _ boxData.transform;
tLL: Point _ [MIN[boxData.box.loX, boxData.box.hiX], MIN[boxData.box.loY, boxData.box.hiY] ];
tUR: Point _ [MAX[boxData.box.loX, boxData.box.hiX], MAX[boxData.box.loY, boxData.box.hiY] ];
pts: ARRAY[0..3] OF Point;
pts[0] _ ImagerTransformation.Transform[t, tLL];
pts[1] _ ImagerTransformation.Transform[t, [tLL.x, tUR.y] ];
pts[2] _ ImagerTransformation.Transform[t, tUR];
pts[3] _ ImagerTransformation.Transform[t, [tUR.x, tLL.y] ];
IF AllEdges[parts] AND boxData.fillColor#NIL THEN {
Imager.SetColor[dc, boxData.fillColor];
Imager.MaskFill[dc, BoxPathProc ];
};
Imager.SetStrokeEnd[dc, square];
FOR edge: INTEGER IN [0..4) DO
IF boxParts.edges[edge] THEN BoxEdgeDraw[edge, pts[edge], pts[(edge + 1) MOD 4]];
ENDLOOP;
};
};
boxData: BoxData _ NARROW[slice.data];
Imager.DoSaveAll[dc, DoBoxDrawParts];
};

BoxDrawSelectionFeedback: PROC [slice: Slice, selectedParts: SliceParts, hotParts: SliceParts, dc: Imager.Context, camera: CameraData, dragInProgress, caretIsMoving, hideHot, quick: BOOL] = {
DoDrawFeedback: PROC = {
BoxEdgeFeedback: PROC [index: INTEGER, p1, p2: Point] = {
Imager.SetStrokeWidth[dc, 2.0*(IF boxData.strokeWidths[index]#0.0 THEN boxData.strokeWidths[index] ELSE 1.0) ];
Imager.SetColor[dc, IF boxData.strokeColors[index]#NIL THEN boxData.strokeColors[index] ELSE Imager.black];
Imager.MaskVector[dc, p1, p2];
};
box: BoundBox _ boxData.box;
t: ImagerTransformation.Transformation _ boxData.transform;
cc: Point;
thisCPisHot, thisCPisSelected: BOOL;
pts: ARRAY[0..3] OF Point;
pts[0] _ ImagerTransformation.Transform[t, [box.loX, box.loY] ];
pts[1] _ ImagerTransformation.Transform[t, [box.loX, box.hiY] ];
pts[2] _ ImagerTransformation.Transform[t, [box.hiX, box.hiY] ];
pts[3] _ ImagerTransformation.Transform[t, [box.hiX, box.loY] ];
FOR corner: INTEGER IN [0..4) DO
thisCPisHot _ hotBoxParts#NIL AND hotBoxParts.corners[corner];
thisCPisSelected _ normalBoxParts#NIL AND normalBoxParts.corners[corner];
IF thisCPisHot THEN GGShapes.DrawSelectedJoint[dc, pts[corner], hot];
IF thisCPisSelected THEN GGShapes.DrawSelectedJoint[dc, pts[corner], normal];
IF NOT thisCPisHot AND NOT thisCPisSelected THEN GGShapes.DrawCP[dc, pts[corner]];
ENDLOOP;
thisCPisHot _ hotBoxParts#NIL AND hotBoxParts.center;
thisCPisSelected _ normalBoxParts#NIL AND normalBoxParts.center;
cc _ ImagerTransformation.Transform[t, [(box.loX+box.hiX)/2.0, (box.loY+box.hiY)/2.0]];
IF thisCPisHot THEN GGShapes.DrawSelectedJoint[dc, cc, hot];
IF thisCPisSelected THEN GGShapes.DrawSelectedJoint[dc, cc, normal];
IF NOT thisCPisHot AND NOT thisCPisSelected THEN GGShapes.DrawCP[dc, cc];
IF NOT quick THEN {
Imager.SetStrokeJoint[dc, round];
Imager.SetStrokeEnd[dc, round];
FOR edge: INTEGER IN [0..4) DO
IF hotBoxParts#NIL AND hotBoxParts.edges[edge] THEN BoxEdgeFeedback[edge, pts[edge], pts[(edge+1) MOD 4]];
ENDLOOP;
};
};
normalBoxParts, hotBoxParts: BoxParts;
boxData: BoxData _ NARROW[slice.data];
IF caretIsMoving OR dragInProgress THEN RETURN;
IF selectedParts = NIL AND hotParts = NIL THEN RETURN;
normalBoxParts _ NARROW[selectedParts];
hotBoxParts _ NARROW[hotParts];
IF camera.quality#quality THEN Imager.DoSaveAll[dc, DoDrawFeedback];
};

BoxDrawAll: PROC [dc: Imager.Context, boxData: BoxData, from: Point, to: Point, camera: CameraData --, drawCPs: BOOL _ TRUE--] = {
BoxPathProc: Imager.PathProc = { moveTo[ll]; lineTo[ul]; lineTo[ur]; lineTo[lr]; };
BoxEdgeDraw: PROC [index: INTEGER, p1, p2: Point] = {
IF boxData.strokeColors[index]=NIL OR boxData.strokeWidths[index]=0.0 THEN RETURN;
Imager.SetStrokeWidth[dc, boxData.strokeWidths[index] ];
Imager.SetColor[dc, boxData.strokeColors[index] ];
Imager.MaskVector[dc, p1, p2];
};
t: ImagerTransformation.Transformation _ boxData.transform;
tLL: Point _ [MIN[to.x, from.x], MIN[to.y, from.y] ];
tUR: Point _ [MAX[to.x, from.x], MAX[to.y, from.y] ];
ll: Point _ ImagerTransformation.Transform[t, tLL];
ul: Point _ ImagerTransformation.Transform[t, [tLL.x, tUR.y] ];
ur: Point _ ImagerTransformation.Transform[t, tUR];
lr: Point _ ImagerTransformation.Transform[t, [tUR.x, tLL.y] ];
IF boxData.fillColor#NIL THEN {
Imager.SetColor[dc, boxData.fillColor];
Imager.MaskFill[dc, BoxPathProc ];
};
Imager.SetStrokeEnd[dc, square];
BoxEdgeDraw[0, ll, ul];
BoxEdgeDraw[1, ul, ur];
BoxEdgeDraw[2, ur, lr];
BoxEdgeDraw[3, lr, ll];
};

BoxDrawTransform: PROC [slice: Slice, parts: SliceParts, dc: Imager.Context, camera: CameraData, transform: ImagerTransformation.Transformation] = {
point, oppositePoint: ImagerTransformation.VEC; -- really points, not vectors
boxData: BoxData _ NARROW[slice.data];
boxParts: BoxParts _ NARROW[parts];
box: BoundBox _ boxData.box;
inverse, totalTransform: ImagerTransformation.Transformation;
cornerCount, edgeCount: INTEGER _ 0;
EasyDraw: PROC = {
Imager.ConcatT[dc, transform]; -- temporary transformation
BoxDrawAll[dc, boxData, [box.loX, box.loY], [box.hiX, box.hiY], camera--, FALSE--];
};
HardDraw: PROC = {
BoxDrawAll[dc, boxData, point, oppositePoint, camera--, FALSE--];
};
IF box.null OR box.infinite THEN ERROR;
IF IsComplete[boxParts] THEN {Imager.DoSaveAll[dc, EasyDraw]; RETURN;};
IF IsEmpty[boxParts] THEN RETURN; -- no parts. Legal.
IF (edgeCount _ CountEdges[boxParts.edges]) >= 2 OR (cornerCount _ CountCorners[boxParts.corners]) >= 3 OR boxParts.center THEN {Imager.DoSaveAll[dc, EasyDraw]; RETURN;};
IF edgeCount=1 THEN { -- one edge. Transform it.
f: ImagerTransformation.FactoredTransformation _ ImagerTransformation.Factor[transform];
globalTranslate: ImagerTransformation.VEC _ f.t;
mInverse: ImagerTransformation.Transformation _ boxData.inverse;
localTranslate: ImagerTransformation.VEC _ ImagerTransformation.TransformVec[mInverse, globalTranslate];
totalTransform: ImagerTransformation.Transformation _ ImagerTransformation.Translate[localTranslate];
SELECT TRUE FROM
boxParts.edges[0] =>  { -- left
IF NOT (boxParts.corners[2] OR boxParts.corners[3]) THEN {
point _ [ box.loX, 0 ];
oppositePoint _ [ box.hiX, box.hiY ];
point _ ImagerTransformation.Transform[m: totalTransform, v: point];
point _ [ point.x, box.loY]; -- result point is transformed in x only
}
ELSE {Imager.DoSaveAll[dc, EasyDraw]; RETURN;}
};
boxParts.edges[1] =>  { -- top
IF NOT (boxParts.corners[0] OR boxParts.corners[3]) THEN {
point _ [ 0, box.hiY ];
oppositePoint _ [ box.loX, box.loY ];
point _ ImagerTransformation.Transform[m: totalTransform, v: point];
point _ [ box.hiX, point.y]; -- result point is transformed in y only
}
ELSE {Imager.DoSaveAll[dc, EasyDraw]; RETURN;}
};
boxParts.edges[2] =>  { -- right
IF NOT (boxParts.corners[0] OR boxParts.corners[1]) THEN {
point _ [ box.hiX, 0 ];
oppositePoint _ [ box.loX, box.loY ];
point _ ImagerTransformation.Transform[m: totalTransform, v: point];
point _ [ point.x, box.hiY]; -- result point is transformed in x only
}
ELSE {Imager.DoSaveAll[dc, EasyDraw]; RETURN;}
};
boxParts.edges[3] =>  { -- bottom
IF NOT (boxParts.corners[1] OR boxParts.corners[2]) THEN {
point _ [ 0, box.loY ];
oppositePoint _ [ box.hiX, box.hiY ];
point _ ImagerTransformation.Transform[m: totalTransform, v: point];
point _ [ box.loX, point.y]; -- result point is transformed in y only
}
ELSE {Imager.DoSaveAll[dc, EasyDraw]; RETURN;}
};
ENDCASE => ERROR;
}
ELSE IF cornerCount IN [1..2] THEN { -- one corner or two isolated corners. Transform one of them.
SELECT TRUE FROM
boxParts.corners[0] => { point _ [ box.loX, box.loY ]; oppositePoint _ [ box.hiX, box.hiY ];};
boxParts.corners[1] => { point _ [ box.loX, box.hiY ]; oppositePoint _ [ box.hiX, box.loY ];};
boxParts.corners[2] => { point _ [ box.hiX, box.hiY ]; oppositePoint _ [ box.loX, box.loY ];};
boxParts.corners[3] => { point _ [ box.hiX, box.loY ]; oppositePoint _ [ box.loX, box.hiY ];};
ENDCASE => ERROR;
inverse _ boxData.inverse;
totalTransform _ ImagerTransformation.Cat[boxData.transform, transform, inverse];
point _ ImagerTransformation.Transform[m: totalTransform, v: point]; -- transform the dragging point
};
Imager.DoSaveAll[dc, HardDraw];
};

BoxTransform: PROC [slice: Slice, parts: SliceParts, transform: ImagerTransformation.Transformation] = {
point, oppositePoint: ImagerTransformation.VEC; -- really points, not vectors
boxData: BoxData _ NARROW[slice.data];
boxParts: BoxParts _ NARROW[parts];
box: BoundBox _ boxData.box;
inverse, totalTransform: ImagerTransformation.Transformation;
cornerCount, edgeCount: INTEGER _ 0;
IF box.null OR box.infinite THEN ERROR;
IF IsComplete[boxParts] THEN {
boxData.transform _ ImagerTransformation.Concat[boxData.transform, transform];
boxData.inverse _ ImagerTransformation.Invert[boxData.transform];
boxData.inverseScale _ ImagerTransformation.Factor[boxData.inverse].s;
BoxSetBoundBox[slice];
RETURN;
};
IF IsEmpty[boxParts] THEN RETURN; -- no parts. Legal.
IF (edgeCount _ CountEdges[boxParts.edges]) >= 2 OR (cornerCount _ CountCorners[boxParts.corners]) >= 3 OR boxParts.center THEN { -- more than one edge or more than two corners. Full transform.
boxData.transform _ ImagerTransformation.Concat[boxData.transform, transform];
boxData.inverse _ ImagerTransformation.Invert[boxData.transform];
boxData.inverseScale _ ImagerTransformation.Factor[boxData.inverse].s;
BoxSetBoundBox[slice];
RETURN;
};
IF edgeCount=1 THEN { -- transform an edge
f: ImagerTransformation.FactoredTransformation _ ImagerTransformation.Factor[transform];
globalTranslate: ImagerTransformation.VEC _ f.t;
mInverse: ImagerTransformation.Transformation _ ImagerTransformation.Invert[boxData.transform];
localTranslate: ImagerTransformation.VEC _ ImagerTransformation.TransformVec[mInverse, globalTranslate];
totalTransform: ImagerTransformation.Transformation _ ImagerTransformation.Translate[localTranslate];
SELECT TRUE FROM
boxParts.edges[0] =>  {
point _ [ box.loX, 0 ];
oppositePoint _ [ box.hiX, box.hiY ];
point _ ImagerTransformation.Transform[m: totalTransform, v: point];
point _ [ point.x, box.loY]; -- result point is transformed in x only
};
boxParts.edges[1] =>  {
point _ [ 0, box.hiY ];
oppositePoint _ [ box.loX, box.loY ];
point _ ImagerTransformation.Transform[m: totalTransform, v: point];
point _ [ box.hiX, point.y]; -- result point is transformed in y only
};
boxParts.edges[2] =>  {
point _ [ box.hiX, 0 ];
oppositePoint _ [ box.loX, box.loY ];
point _ ImagerTransformation.Transform[m: totalTransform, v: point];
point _ [ point.x, box.hiY]; -- result point is transformed in x only
};
boxParts.edges[3] =>  {
point _ [ 0, box.loY ];
oppositePoint _ [ box.hiX, box.hiY ];
point _ ImagerTransformation.Transform[m: totalTransform, v: point];
point _ [ box.loX, point.y]; -- result point is transformed in y only
};
ENDCASE => ERROR;
}
ELSE IF cornerCount IN [1..2] THEN { -- one or two isolated corners. Pick one and transform it.
SELECT TRUE FROM
boxParts.corners[0] => { point _ [ box.loX, box.loY ]; oppositePoint _ [ box.hiX, box.hiY ]; };
boxParts.corners[1] => { point _ [ box.loX, box.hiY ]; oppositePoint _ [ box.hiX, box.loY ]; };
boxParts.corners[2] => { point _ [ box.hiX, box.hiY ]; oppositePoint _ [ box.loX, box.loY ]; };
boxParts.corners[3] => { point _ [ box.hiX, box.loY ]; oppositePoint _ [ box.loX, box.hiY ]; };
ENDCASE => ERROR;
inverse _ boxData.inverse;
totalTransform _ ImagerTransformation.Cat[boxData.transform, transform, inverse];
point _ ImagerTransformation.Transform[m: totalTransform, v: point]; -- transform the dragging point
};
box^ _  [MIN[point.x, oppositePoint.x], MIN[point.y, oppositePoint.y], MAX[point.x, oppositePoint.x], MAX[point.y, oppositePoint.y], FALSE, FALSE];
BoxSetBoundBox[slice];
};

MakeComplete: PROC [parts: SliceParts]  = {
WITH parts SELECT FROM
boxParts: BoxParts => {
boxParts.corners _ ALL[TRUE];
boxParts.edges _ ALL[TRUE];
boxParts.center _ TRUE;
};
circleParts: CircleParts => {
circleParts.cpArray _ ALL[TRUE];
circleParts.outline _ TRUE;
};
ENDCASE => ERROR;
};

IsComplete: PROC [parts: SliceParts] RETURNS [BOOL] = {
IF parts = NIL THEN RETURN[FALSE];
WITH parts SELECT FROM
boxParts: BoxParts => RETURN[ boxParts.corners=ALL[TRUE] AND boxParts.edges=ALL[TRUE] AND boxParts.center ];
circleParts: CircleParts => RETURN[ circleParts.cpArray=ALL[TRUE] AND circleParts.outline];
ENDCASE => ERROR;
};

AllEdges: PROC [parts: SliceParts] RETURNS [BOOL] = {
WITH parts SELECT FROM
boxParts: BoxParts => RETURN[boxParts.edges=ALL[TRUE] ];
circleParts: CircleParts => RETURN[circleParts.outline];
ENDCASE => ERROR;
};


IsEmpty: PROC [parts: SliceParts] RETURNS [BOOL] = {
WITH parts SELECT FROM
boxParts: BoxParts => RETURN[ boxParts.corners=ALL[FALSE] AND boxParts.edges=ALL[FALSE] AND boxParts.center = FALSE];
circleParts: CircleParts => RETURN[ circleParts.cpArray=ALL[FALSE] AND circleParts.outline=FALSE];
ENDCASE => ERROR;
};

CountCorners: PROC [a: CornerArray] RETURNS [count: INTEGER] = {
count _ 0;
FOR corner: INTEGER IN [0..4) DO
IF a[corner] THEN count _ count+1;
ENDLOOP;
};

CountEdges: PROC [a: EdgeArray] RETURNS [count: INTEGER] = {
count _ 0;
FOR edge: INTEGER IN [0..4) DO
IF a[edge] THEN count _ count+1;
ENDLOOP;
};

BoxPointsInDescriptor: PROC [sliceD: SliceDescriptor] RETURNS [pointGen: PointGenerator] = {
parts: BoxParts _ NARROW[sliceD.parts];
pointGen _ NEW[PointGeneratorObj _ [sliceD, 0, 0, NIL] ]; -- toGo and index now used
FOR corner: INTEGER IN [0..4) DO
IF parts.corners[corner] THEN pointGen.toGo _ pointGen.toGo + 1;
ENDLOOP;
IF parts.center THEN pointGen.toGo _ pointGen.toGo + 1;
};

BoxPointPairsInDescriptor: PROC [sliceD: SliceDescriptor] RETURNS [pointPairGen: PointPairGenerator] = {
parts: BoxParts _ NARROW[sliceD.parts];
pointPairGen _ NEW[PointPairGeneratorObj _ [sliceD, 0, 0, NIL] ]; -- toGo and index now used
FOR edge: INTEGER IN [0..4) DO
IF parts.edges[edge] THEN pointPairGen.toGo _ pointPairGen.toGo + 1;
ENDLOOP;
};

BoxNextPoint: PROC [pointGen: PointGenerator] RETURNS [pointAndDone: GGModelTypes.PointAndDone] = {
IF pointGen=NIL OR pointGen.toGo = 0 THEN {
pointAndDone.done _ TRUE;
RETURN;
}
ELSE {
sliceD: SliceDescriptor _ pointGen.sliceD;
slice: Slice _ sliceD.slice;
boxData: BoxData _ NARROW[slice.data];
boxParts: BoxParts _ NARROW[sliceD.parts];
t: ImagerTransformation.Transformation _ boxData.transform;
index: INTEGER;
pointAndDone.done _ FALSE;
FOR index _ pointGen.index, index+1 UNTIL index >=4 DO
IF boxParts.corners[index] THEN EXIT; -- index will point to next availabe point
REPEAT
FINISHED => {
IF NOT boxParts.center THEN index _ index + 1;
};
ENDLOOP;

SELECT index FROM  -- index in [0..4) of next available point
0 => pointAndDone.point _ ImagerTransformation.Transform[t, [boxData.box.loX, boxData.box.loY]];
1 => pointAndDone.point _ ImagerTransformation.Transform[t, [boxData.box.loX, boxData.box.hiY]];
2 => pointAndDone.point _ ImagerTransformation.Transform[t, [boxData.box.hiX, boxData.box.hiY]];
3 => pointAndDone.point _ ImagerTransformation.Transform[t, [boxData.box.hiX, boxData.box.loY]];
4 => pointAndDone.point _ ImagerTransformation.Transform[t, [(boxData.box.loX + boxData.box.hiX)/2.0, (boxData.box.loY + boxData.box.hiY)/2.0]];
ENDCASE => SIGNAL GGError.Problem[msg: "Broken Invariant"];
pointGen.toGo _ pointGen.toGo-1;
pointGen.index _ IF pointGen.toGo=0 THEN 99 ELSE index+1; -- bump to the next available point in the generator
};
};

BoxNextPointPair: PROC [pointPairGen: PointPairGenerator] RETURNS [pointPairAndDone: GGModelTypes.PointPairAndDone] = {
IF pointPairGen=NIL OR pointPairGen.toGo = 0 THEN {
pointPairAndDone.done _ TRUE;
RETURN;
}
ELSE {
sliceD: SliceDescriptor _ pointPairGen.sliceD;
slice: Slice _ sliceD.slice;
boxData: BoxData _ NARROW[slice.data];
boxParts: BoxParts _ NARROW[sliceD.parts];
t: ImagerTransformation.Transformation _ boxData.transform;
index: INTEGER _ -1;
pointPairAndDone.done _ FALSE;
FOR index _ pointPairGen.index, index+1 UNTIL index >=4 DO
IF boxParts.edges[index] THEN EXIT; -- index will point to next availabe edge
ENDLOOP;
SELECT index FROM -- index in [0..4) of next available edge
0 => {
pointPairAndDone.lo _ ImagerTransformation.Transform[t, [boxData.box.loX, boxData.box.loY]];
pointPairAndDone.hi _ ImagerTransformation.Transform[t, [boxData.box.loX, boxData.box.hiY]];
};
1 => {
pointPairAndDone.lo _ ImagerTransformation.Transform[t, [boxData.box.loX, boxData.box.hiY]];
pointPairAndDone.hi _ ImagerTransformation.Transform[t, [boxData.box.hiX, boxData.box.hiY]];
};
2 => {
pointPairAndDone.lo _ ImagerTransformation.Transform[t, [boxData.box.hiX, boxData.box.hiY]];
pointPairAndDone.hi _ ImagerTransformation.Transform[t, [boxData.box.hiX, boxData.box.loY]];
};
3 => {
pointPairAndDone.lo _ ImagerTransformation.Transform[t, [boxData.box.hiX, boxData.box.loY]];
pointPairAndDone.hi _ ImagerTransformation.Transform[t, [boxData.box.loX, boxData.box.loY]];
};
ENDCASE => SIGNAL GGError.Problem[msg: "Broken Invariant"];
pointPairGen.toGo _ pointPairGen.toGo - 1;
pointPairGen.index _ IF pointPairGen.toGo=0 THEN 99 ELSE index+1; -- bump to the next available pair in the generator
};
};

BoxEmptyParts: PROC [slice: Slice, parts: SliceParts] RETURNS [BOOL] = {
boxParts: BoxParts _ NARROW[parts]; -- NARROW for type checking
RETURN[IsEmpty[boxParts]];
};

NearestBoxPoint: PROC [slice: Slice, point: Point] RETURNS [index: [-1..3], center: BOOL] = {
sliceParts: SliceParts _ BoxNewParts[slice, NIL, slice];
boxHitData: BoxHitData;
success: BOOL;
hitData: REF ANY;
sliceD: SliceDescriptor _ NEW[SliceDescriptorObj _ [slice, sliceParts]];
[----, ----, hitData, success] _ BoxClosestPoint[sliceD: sliceD, testPoint: point, tolerance: GGUtility.plusInfinity];
IF NOT success THEN ERROR;
boxHitData _ NARROW[hitData];
center _ boxHitData.center > -1;
index _ boxHitData.corner;
IF index = -1 AND NOT center THEN ERROR;
};

BoxNewParts: PROC [slice: Slice, hitData: REF ANY, mode: SelectMode] RETURNS [parts: SliceParts] = {
boxHitData: BoxHitData _ NARROW[hitData];
boxParts: BoxParts;
parts _boxParts_ NEW[BoxPartsObj _ [corners: ALL[FALSE], edges: ALL[FALSE], center: FALSE]];
SELECT mode FROM
joint => {
IF boxHitData.corner#-1 THEN boxParts.corners[boxHitData.corner] _ TRUE
ELSE IF boxHitData.center#-1 THEN boxParts.center _ TRUE
ELSE IF boxHitData.edge#-1 THEN {
index: [-1..3];
center: BOOL;
[index, center] _ NearestBoxPoint[slice, boxHitData.hitPoint];
IF center THEN boxParts.center _ TRUE
ELSE boxParts.corners[index] _ TRUE;
};
};
segment => {
IF boxHitData.center#-1 THEN MakeComplete[boxParts]
ELSE IF boxHitData.edge#-1 THEN boxParts.edges[boxHitData.edge] _ TRUE;
};
controlPoint => {
boxParts.corners _ ALL[TRUE];
boxParts.center _ TRUE;
};
traj, topLevel, slice => MakeComplete[boxParts];
none => { -- prefer center to corner to edge if true
IF boxHitData.center#-1 THEN boxParts.center _ TRUE
ELSE IF boxHitData.corner#-1 THEN boxParts.corners[boxHitData.corner] _ TRUE
ELSE IF boxHitData.edge#-1 THEN boxParts.edges[boxHitData.edge] _ TRUE;
};
ENDCASE => ERROR;
};

BoxUnionParts: PROC [slice: Slice, partsA: SliceParts, partsB: SliceParts] RETURNS [aPlusB: SliceParts] = {
boxPartsA: BoxParts _ NARROW[partsA];
boxPartsB: BoxParts _ NARROW[partsB];
newParts: BoxParts _ NEW[BoxPartsObj _ [corners: ALL[FALSE], edges: ALL[FALSE], center: FALSE ] ];
FOR i: INTEGER IN [0..4) DO
newParts.corners[i] _ boxPartsA.corners[i] OR boxPartsB.corners[i];
newParts.edges[i] _ boxPartsA.edges[i] OR boxPartsB.edges[i];
ENDLOOP;
newParts.center _ boxPartsA.center OR boxPartsB.center;
RETURN[newParts];
};

BoxDiffParts: PROC [slice: Slice, partsA: SliceParts, partsB: SliceParts] RETURNS [aMinusB: SliceParts] = {
boxPartsA: BoxParts _ NARROW[partsA];
boxPartsB: BoxParts _ NARROW[partsB];
newParts: BoxParts _ NEW[BoxPartsObj _ [corners: ALL[FALSE], edges: ALL[FALSE], center: FALSE ] ];
IF partsB=NIL THEN {newParts^ _ boxPartsA^; aMinusB _ newParts; RETURN;};
FOR i: INTEGER IN [0..4) DO
newParts.corners[i] _ IF boxPartsB.corners[i] THEN FALSE ELSE boxPartsA.corners[i];
newParts.edges[i] _ IF boxPartsB.edges[i] THEN FALSE ELSE boxPartsA.edges[i];
ENDLOOP;
newParts.center _ IF boxPartsB.center THEN FALSE ELSE boxPartsA.center;
RETURN[newParts];
};

BoxMovingParts: PROC [slice: Slice, parts: SliceParts] RETURNS [moving: SliceParts] = {
boxParts: BoxParts _ NARROW[parts];
newParts: BoxParts _ NEW[BoxPartsObj _ [corners: ALL[TRUE], edges: ALL[TRUE], center: TRUE ] ];
cornerCount: INTEGER _ CountCorners[boxParts.corners];
edgeCount: INTEGER _ CountEdges[boxParts.edges];
centerCount: INTEGER _ IF boxParts.center THEN 1 ELSE 0;
IF (cornerCount+edgeCount)>=2 OR centerCount > 0 THEN {moving _ newParts; RETURN;}; -- everything moving
IF cornerCount=1 THEN { -- turn off the opposite corner
FOR i: INTEGER IN [0..4) DO
IF boxParts.corners[i] THEN newParts.corners[(i+2) MOD 4] _ FALSE;
ENDLOOP;
}
ELSE IF edgeCount=1 THEN { -- turn off the opposite edge and two corners
FOR i: INTEGER IN [0..4) DO
IF boxParts.edges[i] THEN {
newParts.edges[(i+2) MOD 4] _ FALSE;
newParts.corners[(i+2) MOD 4] _ FALSE;
newParts.corners[(i+3) MOD 4] _ FALSE;
};
ENDLOOP;
}
ELSE {newParts.edges _ ALL[FALSE]; newParts.corners _ ALL[FALSE]; }; -- nothing at all is moving
moving _ newParts; -- RETURN[newParts]
};

BoxFixedParts: PROC [slice: Slice, parts: SliceParts, selectedList: LIST OF REF ANY] RETURNS [fixed: SliceParts] = {
moving: SliceParts _ BoxMovingParts[slice, parts];
allParts: BoxParts _ NEW[BoxPartsObj];
MakeComplete[allParts];
fixed _ BoxDiffParts[slice, allParts, moving];
};

BoxAugmentParts: PROC [slice: Slice, parts: SliceParts, selectClass: SelectionClass] RETURNS [more: SliceParts] = {
boxParts: BoxParts _ NARROW[parts];
newParts: BoxParts;
newParts _ NEW[BoxPartsObj _ [corners: boxParts.corners, edges: boxParts.edges, center: boxParts.center] ];
FOR i: INTEGER IN [0..4) DO
IF boxParts.edges[i] THEN {
newParts.corners[i] _ TRUE;
newParts.corners[(i+1) MOD 4] _ TRUE;
};
ENDLOOP;
RETURN[newParts];
};

BoxClosestPoint: PROC [sliceD: SliceDescriptor, testPoint: Point, tolerance: REAL] RETURNS [bestPoint: Point, bestDist: REAL, hitData: REF ANY, success: BOOL _ FALSE] = {
sliceBBox: BoundBox _ sliceD.slice.boundBox;
toleranceBox: GGBasicTypes.BoundBoxObj _ [sliceBBox.loX-tolerance, sliceBBox.loY-tolerance, sliceBBox.hiX+tolerance, sliceBBox.hiY+tolerance, FALSE, FALSE];
IF PointIsInBox[testPoint, toleranceBox] THEN {
index: NAT _ 9999;
boxHitData: BoxHitData;
boxData: BoxData _ NARROW[sliceD.slice.data];
box: BoundBox _ boxData.box;
boxParts: BoxParts _ NARROW[sliceD.parts];
thisPoint: Point;
thisDist: REAL;
localTestPoint: Point _ GGTransform.Transform[boxData.inverse, testPoint];
localTolerance: REAL _ ABS[tolerance*MAX[boxData.inverseScale.x, boxData.inverseScale.y]]; -- MAX function is not correct when text is skewed.
[bestDist, index, bestPoint, success] _ GGBoundBox.NearestPoint[box, localTestPoint, localTolerance, boxParts.corners];
IF success THEN {
hitData _ boxHitData _ NEW[BoxHitDataObj _ [corner: index, edge: -1, center: -1, hitPoint: [0,0]]];
};
IF boxParts.center THEN { -- center is a candidate for closest point, too
thisPoint _ [(box.loX+box.hiX)/2.0, (box.loY+box.hiY)/2.0]; -- center point
thisDist _ GGVector.Distance[localTestPoint, thisPoint];
IF thisDist < bestDist AND thisDist < localTolerance THEN {
bestDist _ thisDist;
bestPoint _ thisPoint;
IF success THEN boxHitData.corner _ -1
ELSE hitData _ boxHitData _ NEW[BoxHitDataObj _ [corner: -1, edge: -1, center: -1, hitPoint: [0,0]]];
boxHitData.center _ 0;
success _ TRUE;
};
};
IF success THEN {
bestPoint _ GGTransform.Transform[boxData.transform, bestPoint];
boxHitData.hitPoint _ bestPoint;
bestDist _ GGVector.Distance[testPoint, bestPoint];
};
};
};

BoxClosestSegment: PROC [sliceD: SliceDescriptor, testPoint: Point, tolerance: REAL] RETURNS [bestPoint: Point, bestDist: REAL, hitData: REF ANY, success: BOOL _ FALSE] = {
sliceBBox: BoundBox _ sliceD.slice.boundBox;
toleranceBox: GGBasicTypes.BoundBoxObj _ [sliceBBox.loX-tolerance, sliceBBox.loY-tolerance, sliceBBox.hiX+tolerance, sliceBBox.hiY+tolerance, FALSE, FALSE]; -- box in GG coordinates
IF PointIsInBox[testPoint, toleranceBox] THEN {
seg: NAT _ 9999;
boxHitData: BoxHitData;
boxData: BoxData _ NARROW[sliceD.slice.data];
boxParts: BoxParts _ NARROW[sliceD.parts];
localTestpoint: Point _ GGTransform.Transform[boxData.inverse, testPoint];
localTolerance: REAL _ABS [tolerance*MAX[boxData.inverseScale.x, boxData.inverseScale.y]]; -- MAX function is not correct when box is skewed.
[bestDist, seg, bestPoint, success] _ GGBoundBox.NearestSegment[boxData.box, localTestpoint, localTolerance, boxParts.edges];
IF success THEN {
bestPoint _ GGTransform.Transform[boxData.transform, bestPoint];
bestDist _ GGVector.Distance[testPoint, bestPoint];
hitData _ boxHitData _ NEW[BoxHitDataObj _ [corner: -1, edge: seg, center: -1, hitPoint: bestPoint] ];
};
};
};

globalEdge: Edge;
BoxLineIntersection: PUBLIC PROC [sliceD: SliceDescriptor, line: Line] RETURNS [points: LIST OF Point, pointCount: NAT] = {
boxData: BoxData _ NARROW[sliceD.slice.data];
boxParts: BoxParts _ NARROW[sliceD.parts];
bBox: BoundBox _ boxData.box;
noHit: BOOL;
hits: ARRAY[0..3] OF BOOL;
hitPoints: ARRAY[0..3] OF Point;
epsilon: REAL = 0.072;
localLine: Line _ GGLines.LineTransform[line, boxData.inverse];
localPoints: LIST OF Point;
localPoints _ NIL;
pointCount _ 0;
FOR i: NAT IN [0..3] DO hits[i] _ FALSE; ENDLOOP;
FOR i: NAT IN [0..2] DO
IF NOT boxParts.edges[i] THEN LOOP; -- only intersect edges mentioned in sliceD.
FillBoxEdge[globalEdge, bBox, i];
[hitPoints[i], noHit] _ GGLines.LineMeetsEdge[localLine, globalEdge];
IF noHit THEN LOOP;
IF i>0 AND hits[i-1] THEN {
IF ABS[hitPoints[i].x - hitPoints[i-1].x] < epsilon THEN LOOP;
IF ABS[hitPoints[i].y - hitPoints[i-1].y] < epsilon THEN LOOP;
};
localPoints _ CONS[hitPoints[i], localPoints];
pointCount _ pointCount + 1;
hits[i] _ TRUE;
REPEAT
FINISHED => {
IF NOT boxParts.edges[3] THEN GOTO End;  -- only intersect edges mentioned in sliceD.
FillBoxEdge[globalEdge, bBox, 3];
[hitPoints[3], noHit] _ GGLines.LineMeetsEdge[localLine, globalEdge];
IF noHit THEN GOTO End;
IF hits[2] THEN {
IF ABS[hitPoints[3].x - hitPoints[2].x] < epsilon THEN GOTO End;
IF ABS[hitPoints[3].y - hitPoints[2].y] < epsilon THEN GOTO End;
};
IF hits[0] THEN {
IF ABS[hitPoints[3].x - hitPoints[0].x] < epsilon THEN GOTO End;
IF ABS[hitPoints[3].y - hitPoints[0].y] < epsilon THEN GOTO End;
};
localPoints _ CONS[hitPoints[3], localPoints];
pointCount _ pointCount + 1;
hits[3] _ TRUE;
EXITS
End => NULL;
};
ENDLOOP;
IF pointCount > 2 THEN ERROR;
points _ NIL;
FOR list: LIST OF Point _ localPoints, list.rest UNTIL list = NIL DO
points _ CONS[ImagerTransformation.Transform[m: boxData.transform, v: list.first], points];
ENDLOOP;
};

BoxHitDataAsSimpleCurve: PROC [slice: Slice, hitData: REF ANY] RETURNS [simpleCurve: REF ANY] = {
boxHitData: BoxHitData _ NARROW[hitData];
boxData: BoxData _ NARROW[slice.data];
bBox: BoundBox _ boxData.box;
edge: Edge;
IF boxHitData.edge = -1 THEN RETURN[NIL];
edge _ GGLines.CreateEmptyEdge[];
FillBoxEdge[edge, bBox, boxHitData.edge];
GGLines.FillEdgeTransform[edge, boxData.transform, edge];
simpleCurve _ edge;
};

FillBoxEdge: PRIVATE PROC [edge: Edge, bBox: BoundBox, index: NAT] = {
IF bBox.null OR bBox.infinite THEN ERROR;
SELECT index FROM
0 => GGLines.FillEdge[[bBox.loX, bBox.loY], [bBox.loX, bBox.hiY], edge];
1 => GGLines.FillEdge[[bBox.loX, bBox.hiY], [bBox.hiX, bBox.hiY], edge];
2 => GGLines.FillEdge[[bBox.hiX, bBox.hiY], [bBox.hiX, bBox.loY], edge];
3 => GGLines.FillEdge[[bBox.hiX, bBox.loY], [bBox.loX, bBox.loY], edge];
ENDCASE => ERROR;
};


boxCornerRopes: ARRAY [0..4) OF Rope.ROPE = [
"lower left corner", "upper left corner", "upper right corner", "lower right corner"];
boxEdgeRopes: ARRAY [0..4) OF Rope.ROPE = [
"left edge", "top edge", "right edge", "bottom edge"];
BoxDescribe: PROC [slice: Slice, parts: SliceParts] RETURNS [rope: Rope.ROPE] = {
prefix: Rope.ROPE;
boxParts: BoxParts _ NARROW[parts];
cornerCount: INTEGER _ CountCorners[boxParts.corners];
edgeCount: INTEGER _ CountEdges[boxParts.edges];
IF cornerCount+edgeCount>1 THEN RETURN["multiple parts of a Box slice"] ELSE {
centerOnly: BOOL _ boxParts.center AND edgeCount=0 AND cornerCount=0;
oneEdge: BOOL _ NOT boxParts.center AND edgeCount=1 AND cornerCount=0;
oneCorner: BOOL _ NOT boxParts.center AND cornerCount=1 AND edgeCount=0;
noParts: BOOL _ NOT boxParts.center AND cornerCount=0 AND edgeCount=0;
SELECT TRUE FROM
oneCorner => {
FOR i: INTEGER IN [0..4) DO
IF boxParts.corners[i] THEN {
prefix _ boxCornerRopes[i];
EXIT;
};
ENDLOOP;
};
oneEdge => {
FOR i: INTEGER IN [0..4) DO
IF boxParts.edges[i] THEN {
prefix _ boxEdgeRopes[i];
EXIT;
};
ENDLOOP;
};
centerOnly => prefix _ "center";
noParts => prefix _ "NO parts";
ENDCASE => ERROR;
rope _ Rope.Concat[prefix, " of a Box slice"];
};
};

BoxFileout: PROC [slice: Slice, f: IO.STREAM] = {
boxData: BoxData _ NARROW[slice.data];
GGParseOut.WritePoint[f, [ boxData.box.loX, boxData.box.loY] ];
f.PutChar[IO.SP];
GGParseOut.WritePoint[f, [ boxData.box.hiX, boxData.box.hiY] ];
f.PutChar[IO.SP];
GGParseOut.WriteTransformation[f, boxData.transform];
f.PutRope[" strokeWidths: ( "];
FOR edge: INTEGER IN [0..4) DO
f.PutF["%g ", [real[boxData.strokeWidths[edge]]] ];
ENDLOOP;
f.PutRope[") strokeColors: ( "];
FOR edge: INTEGER IN [0..4) DO
GGParseOut.WriteColor[f, boxData.strokeColors[edge]];
f.PutChar[IO.SP];
ENDLOOP;
f.PutRope[") fillColor: "];
GGParseOut.WriteColor[f, boxData.fillColor];
f.PutChar[IO.SP];
};

BoxFilein: PROC [f: IO.STREAM, version: REAL, feedback: Viewer] RETURNS [slice: Slice] = {
boxData: BoxData;
box: BoundBox;
p1, p2: Point;
transform: ImagerTransformation.Transformation;
strokes: ARRAY [0..4) OF REAL;
colors: ARRAY [0..4) OF Imager.Color;
fill: Imager.Color;
GGParseIn.ReadBlank[f];
p1 _ GGParseIn.ReadPoint[f];
GGParseIn.ReadBlank[f];
p2 _ GGParseIn.ReadPoint[f];
GGParseIn.ReadBlank[f];
transform _ GGParseIn.ReadTransformation[f];
GGParseIn.ReadBlankAndRope[f, "strokeWidths: ("];
FOR edge: INTEGER IN [0..4) DO
strokes[edge] _ GGParseIn.ReadBlankAndReal[f];
ENDLOOP;
GGParseIn.ReadBlankAndRope[f, ") strokeColors: ("];
FOR edge: INTEGER IN [0..4) DO
GGParseIn.ReadBlank[f];
colors[edge] _ GGParseIn.ReadColor[f];
ENDLOOP;
GGParseIn.ReadBlankAndRope[f, ") fillColor: "];
fill _ GGParseIn.ReadColor[f];
box _ GGBoundBox.CreateBoundBox[ p1.x, p1.y, p2.x, p2.y ];
slice _ MakeBoxSlice[box, ur, transform].slice;
boxData _ NARROW[slice.data];
FOR edge: INTEGER IN [0..4) DO
boxData.strokeWidths[edge] _ strokes[edge];
boxData.strokeColors[edge] _ colors[edge];
ENDLOOP;
boxData.fillColor _ fill;
};

BoxSetStrokeColor: PROC [slice: Slice, parts: SliceParts, color: Imager.Color] = {
boxParts: BoxParts _ NARROW[parts];
boxData: BoxData _ NARROW[slice.data];
FOR edge: INTEGER IN [0..4) DO
IF boxParts.edges[edge] THEN boxData.strokeColors[edge] _ color;
ENDLOOP;
};

BoxGetStrokeColor: PROC [slice: Slice, parts: SliceParts] RETURNS [color: Imager.Color] = {
boxParts: BoxParts _ NARROW[parts];
boxData: BoxData _ NARROW[slice.data];
FOR edge: INTEGER IN [0..4) DO
IF boxParts.edges[edge] THEN color _ boxData.strokeColors[edge];
ENDLOOP;
};

BoxSetFillColor: PROC [slice: Slice, color: Imager.Color] = {
boxData: BoxData _ NARROW[slice.data];
boxData.fillColor _ color;
};

BoxGetFillColor: PROC [slice: Slice] RETURNS [color: Imager.Color] = {
boxData: BoxData _ NARROW[slice.data];
color _ boxData.fillColor;
};

BoxSetStrokeWidth: PROC [slice: Slice, parts: SliceParts, strokeWidth: REAL] = {
boxParts: BoxParts _ NARROW[parts];
boxData: BoxData _ NARROW[slice.data];
FOR edge: INTEGER IN [0..4) DO
IF boxParts.edges[edge] THEN boxData.strokeWidths[edge] _ strokeWidth;
ENDLOOP;
BoxSetBoundBox[slice];
};

BoxGetStrokeWidth: PROC [slice: Slice, parts: SliceParts] RETURNS [strokeWidth: REAL] = {
boxParts: BoxParts _ NARROW[parts];
boxData: BoxData _ NARROW[slice.data];
FOR edge: INTEGER IN [0..4) DO
IF boxParts.edges[edge] THEN strokeWidth _ boxData.strokeWidths[edge];
ENDLOOP;
};
CircleData: TYPE = REF CircleDataObj;
CircleDataObj: TYPE = RECORD [
circle: Circle,	-- a representation of a unit circle (for the convenience of GGCircles.LineMeetsCircle)
tightBox: BoundBox,
transform: ImagerTransformation.Transformation,
scale: Vector,	-- cached value of ImagerTransformation.Factor[transform].s
evenScaling: BOOL,
simpleCircle: Circle, -- for CircleHitDataAsSimpleCurve
inverse: ImagerTransformation.Transformation,
inverseScale: Vector,	-- cached value of ImagerTransformation.Factor[inverse].s
startPoint: Point,	-- original point on circumference when circle was created
strokeWidth: REAL,
strokeColor: Imager.Color,
fillColor: Imager.Color
];

MaxCirclePoints: INTEGER = 5;
CirclePoints: TYPE = [0..MaxCirclePoints); -- origin, left, top, right, bottom
CircleParts: TYPE = REF CirclePartsObj;
CirclePartsObj: TYPE = RECORD [
cpArray: ARRAY CirclePoints OF BOOL, -- used when origin or CPs are selected
outline: BOOL -- TRUE if outline itself is in parts
];

CircleHitData: TYPE = REF CircleHitDataObj;
CircleHitDataObj: TYPE = RECORD [
index: [-1..MaxCirclePoints), -- records index of which origin or CP is hit. -1 => no hit
hitPoint: Point,
outline: BOOL -- TRUE if outline itself is hit
];

BuildCircleSliceClass: PUBLIC PROC [] RETURNS [class: SliceClass] = {
OPEN GGSlice;
class _ NEW[SliceClassObj _ [
type: $Circle,
getBoundBox: CircleBoundBox,
getTightBox: CircleTightBox,
copy: CircleCopy,
drawParts: CircleDrawParts,
drawTransform: CircleDrawTransform,
drawSelectionFeedback: CircleDrawSelectionFeedback,
drawAttractorFeedback: NoOpDrawAttractorFeedback,
transform: CircleTransform,
describe: CircleDescribe,
fileout: CircleFileout,
filein: CircleFilein,
emptyParts: CircleEmptyParts,
newParts: CircleNewParts,
unionParts: CircleUnionParts,
differenceParts: CircleDiffParts,
movingParts: CircleMovingParts,
fixedParts: CircleFixedParts,
augmentParts: CircleAugmentParts,
pointsInDescriptor: CirclePointsInDescriptor,
pointPairsInDescriptor: GGSlice.NoOpPointPairsInDescriptor,
nextPoint: CircleNextPoint,
nextPointPair: GGSlice.NoOpNextPointPair,
closestPoint: CircleClosestPoint,
closestPointAndTangent: NIL,
closestSegment: CircleClosestSegment,
lineIntersection: CircleLineIntersection,
circleIntersection: NoOpCircleIntersection,
hitDataAsSimpleCurve: CircleHitDataAsSimpleCurve,
setStrokeWidth: CircleSetStrokeWidth,
getStrokeWidth: CircleGetStrokeWidth,
setStrokeColor: CircleSetStrokeColor,
getStrokeColor: CircleGetStrokeColor,
setFillColor: CircleSetFillColor,
getFillColor: CircleGetFillColor
]];
};

MakeCircleSlice: PUBLIC PROC [origin: Point, outerPoint: Point, strokeWidth: REAL _ 2.0, strokeColor: Imager.Color _ Imager.black, fillColor: Imager.Color _ NIL] RETURNS [sliceD: SliceDescriptor] = {
circleData: CircleData _ NEW[CircleDataObj];
circleParts: CircleParts _ NEW[CirclePartsObj _ [ALL[FALSE], FALSE ]];
slice: Slice;
circleData.circle _ GGCircles.CircleFromPointAndRadius[[0,0], 1.0];
circleData.tightBox _ GGBoundBox.NullBoundBox[];
circleData.startPoint _ outerPoint;
circleData.strokeWidth _ strokeWidth;
circleData.strokeColor _ strokeColor;
circleData.fillColor _ fillColor;
slice _ NEW[SliceObj _ [
class: FetchSliceClass[$Circle],
data: circleData,
parent: NIL,
selectedInFull: [FALSE, FALSE, FALSE],
boundBox: GGBoundBox.CreateBoundBox[0,0,0,0]
]];
IF origin=outerPoint THEN circleData.startPoint _ [origin.x+20.0, origin.y+20.0]; -- prevent degenerate circle
circleData.transform _ ImagerTransformation.PreScale[ImagerTransformation.Translate[origin],  GGVector.Distance[origin, circleData.startPoint]];
circleData.scale _ ImagerTransformation.SingularValues[circleData.transform];
circleData.inverse _ ImagerTransformation.Invert[circleData.transform];
circleData.inverseScale _ ImagerTransformation.SingularValues[circleData.inverse];
circleData.evenScaling _ TRUE;
circleData.simpleCircle _ GGCircles.CircleFromPointAndRadius[origin, GGVector.Distance[origin, circleData.startPoint]];
CircleSetBoundBox[slice];
sliceD _ NEW[SliceDescriptorObj _ [slice, circleParts] ];
[] _ CircleClosestPoint[sliceD, outerPoint, 999.0]; -- only purpose of this call is to set up the HitData so that the first call to SelectSlice (in GGMouseEventImplA.EndCircle) works
};

CircleBoundBox: PROC [slice: Slice, parts: SliceParts] RETURNS [box: BoundBox] = {
RETURN[slice.boundBox];
};

CircleTightBox: PROC [slice: Slice, parts: SliceParts] RETURNS [box: BoundBox] = {
RETURN[slice.boundBox];
};

CircleSetBoundBox: PROC [slice: Slice] = {
cpHalf: REAL _ GGModelTypes.halfJointSize + 1;
strokeWidth: REAL _ NARROW[slice.data, CircleData].strokeWidth;
pad: REAL _ MAX[cpHalf, strokeWidth];
circleData: CircleData _ NARROW[slice.data];
epsilon: REAL = 1.0E-6;
origin: Point _ ImagerTransformation.Transform[circleData.transform, [0.0, 0.0]];
minor: Point _ ImagerTransformation.Transform[circleData.transform, [0.0, 1.0]];
major: Point _ ImagerTransformation.Transform[circleData.transform, [1.0, 0.0]];
radius: REAL _ RealFns.SqRt[MAX[GGVector.DistanceSquared[minor, origin], GGVector.DistanceSquared[major, origin]]];
GGBoundBox.UpdateBoundBox[circleData.tightBox, origin.x-radius, origin.y-radius, origin.x+radius, origin.y+radius];
GGBoundBox.UpdateCopyBoundBox[bBox: slice.boundBox, from: circleData.tightBox];
GGBoundBox.EnlargeByOffset[slice.boundBox, pad];
IF ABS[circleData.inverseScale.x - circleData.inverseScale.y] < epsilon THEN {
origin: Point;  radius: REAL;
origin _ ImagerTransformation.Transform[circleData.transform, [0.0, 0.0]];
radius _ circleData.scale.x;
circleData.evenScaling _ TRUE;
GGCircles.FillCircleFromPointAndRadius[origin, radius, circleData.simpleCircle];
}
ELSE circleData.evenScaling _ FALSE;
};

CircleCopy: PROC [slice: Slice] RETURNS [copy: Slice] = {
circleData: CircleData _ NARROW[slice.data];
newData: CircleData;
copy _ MakeCircleSlice [[0.0, 0.0], [1.0, 1.0], circleData.strokeWidth, circleData.strokeColor,  circleData.fillColor].slice;
newData _ NARROW[copy.data];
newData.transform _ ImagerTransformation.Copy[circleData.transform];
newData.scale _ circleData.scale;
newData.inverse _ ImagerTransformation.Copy[circleData.inverse];
newData.inverseScale _ circleData.inverseScale;
newData.evenScaling _ circleData.evenScaling;
newData.simpleCircle _ GGCircles.CreateEmptyCircle[];
GGCircles.CopyCircle[from: circleData.simpleCircle, to: newData.simpleCircle];
};

CircleDrawParts: PROC [slice: Slice, parts: SliceParts, dc: Imager.Context, camera: CameraData, quick: BOOL] = {
DoCircleDrawOutline: PROC = {
Imager.ConcatT[dc, circleData.transform];
CircleDrawOutline[dc, circleData];
};
circleData: CircleData _ NARROW[slice.data];
circleParts: CircleParts _ NARROW[parts];
IF circleParts = NIL OR circleParts.outline THEN Imager.DoSaveAll[dc, DoCircleDrawOutline];
};

CircleDrawSelectionFeedback: PROC [slice: Slice, selectedParts: SliceParts, hotParts: SliceParts, dc: Imager.Context, camera: CameraData, dragInProgress, caretIsMoving, hideHot, quick: BOOL] = {
DoDrawFeedback: PROC = {
DrawOutlineFeedback: PROC = {
CirclePath: Imager.PathProc = { -- code copied from GGShapesImpl.DrawCircle
moveTo[[leftSide.x, leftSide.y]];
arcTo[[rightSide.x,  rightSide.y], [ leftSide.x, leftSide.y]];
};
leftSide: Point _ [-1.0, 0.0];
rightSide: Point _ [1.0, 0.0];
strokeScale: REAL _ ABS[MAX[circleData.inverseScale.x, circleData.inverseScale.y]];
strokeWidth: REAL _ strokeScale*2.0*(IF circleData.strokeWidth=0.0 THEN 1.0 ELSE circleData.strokeWidth);
Imager.ConcatT[dc, circleData.transform];
Imager.SetStrokeWidth[dc, strokeWidth];
Imager.SetColor[dc, IF circleData.strokeColor#NIL THEN circleData.strokeColor ELSE Imager.black];
Imager.MaskStroke[dc, CirclePath, TRUE];
};
thisCPisHot, thisCPisSelected: BOOL;
pts: ARRAY[0..4] OF Point;
pts[0] _ ImagerTransformation.Transform[t, [0.0, 0.0] ];
pts[1] _ ImagerTransformation.Transform[t, [-1.0, 0.0] ];
pts[2] _ ImagerTransformation.Transform[t, [0.0, 1.0] ];
pts[3] _ ImagerTransformation.Transform[t, [1.0, 0.0] ];
pts[4] _ ImagerTransformation.Transform[t, [0.0, -1.0] ];
IF NOT quick AND IsComplete[normalCircleParts] THEN Imager.DoSaveAll[dc, DrawOutlineFeedback]; 
FOR index: CirclePoints IN [0..MaxCirclePoints) DO
thisCPisHot _ hotCircleParts#NIL AND hotCircleParts.cpArray[index];
thisCPisSelected _ normalCircleParts#NIL AND normalCircleParts.cpArray[index];
IF thisCPisHot THEN GGShapes.DrawSelectedJoint[dc, pts[index], hot];
IF thisCPisSelected THEN GGShapes.DrawSelectedJoint[dc, pts[index], normal];
IF NOT thisCPisHot AND NOT thisCPisSelected THEN GGShapes.DrawCP[dc, pts[index]];
ENDLOOP;
};
normalCircleParts, hotCircleParts: CircleParts;
circleData: CircleData _ NARROW[slice.data];
t: ImagerTransformation.Transformation _ circleData.transform;
IF caretIsMoving OR dragInProgress THEN RETURN;
IF selectedParts = NIL AND hotParts = NIL THEN RETURN;
normalCircleParts _ NARROW[selectedParts];
hotCircleParts _ NARROW[hotParts];
IF camera.quality#quality THEN Imager.DoSaveAll[dc, DoDrawFeedback];
};

CircleDrawTransform: PROC [slice: Slice, parts: SliceParts, dc: Imager.Context, camera: CameraData, transform: ImagerTransformation.Transformation] = {
isOrigin: BOOL _ FALSE;
cpCount: INT _ 0;
cpIndex: INT _ -1;
originPoint, edgePoint, pointInUnitSpace: Point;
newTransform: ImagerTransformation.Transformation;
circleData: CircleData _ NARROW[slice.data];
circleParts: CircleParts _ NARROW[parts];
EasyDrawOutline: PROC = {
Imager.ConcatT[dc, ImagerTransformation.Concat[circleData.transform, transform]];
CircleDrawOutline[dc, circleData];
};
HardDrawOutline: PROC = {
Imager.ConcatT[dc, newTransform];
CircleDrawOutline[dc, circleData];
};
IF circleParts.cpArray[0] THEN isOrigin _ TRUE;
FOR index: CirclePoints IN [1..MaxCirclePoints) DO
IF circleParts.cpArray[index] THEN{ 
cpCount _ cpCount + 1;
cpIndex _ index;
};
ENDLOOP;
IF isOrigin OR cpCount > 1 THEN {  -- treat as complete circle selected
Imager.DoSaveAll[dc, EasyDrawOutline];
RETURN;
}; 
originPoint _ ImagerTransformation.Transform[circleData.transform, [0.0, 0.0]];
IF cpCount = 0 AND NOT isOrigin THEN {
edgePoint _ GGVector.Add[v1: GGVector.Sub[v1: circleData.startPoint, v2: originPoint], v2: ImagerTransformation.Factor[transform].t]; -- edgepoint relative to origin
edgePoint _ GGVector.Add[originPoint, edgePoint]; -- make edgepoint absolute
}
ELSE { -- this is the normal case when a single CP is selected
edgePoint _ ImagerTransformation.Transform[circleData.transform, SELECT cpIndex FROM
1 => [-1.0, 0.0],
2 => [0.0, 1.0],
3 => [1.0, 0.0],
4 => [0.0, -1.0],
ENDCASE => ERROR];
edgePoint _ ImagerTransformation.Transform[transform, edgePoint]; -- move the edgepoint
};
pointInUnitSpace _ ImagerTransformation.Transform[circleData.inverse, edgePoint];
newTransform _ ImagerTransformation.PreScale[circleData.transform, MAX[GGVector.Magnitude[pointInUnitSpace], 0.01] ];
Imager.DoSaveAll[dc, HardDrawOutline];
};

CircleDrawOutline: PROC [dc: Imager.Context, circleData: CircleData]  = {
FillItIn: PROC = {
Imager.SetColor[dc, circleData.fillColor];
Imager.MaskFill[dc, CirclePath, TRUE]
};
CirclePath: Imager.PathProc = { -- code copied from GGShapesImpl.DrawCircle
moveTo[[leftSide.x, leftSide.y]];
arcTo[[rightSide.x,  rightSide.y], [ leftSide.x, leftSide.y]];
};
leftSide: Point _ [-1.0, 0.0];
rightSide: Point _ [1.0, 0.0];
IF circleData.fillColor#NIL THEN Imager.DoSaveAll[dc, FillItIn];
IF circleData.strokeColor#NIL AND circleData.strokeWidth#0.0 THEN {
strokeScale: REAL _ ABS[MAX[circleData.inverseScale.x, circleData.inverseScale.y]];
Imager.SetColor[dc, circleData.strokeColor];
Imager.SetStrokeWidth[dc, circleData.strokeWidth*strokeScale];
Imager.MaskStroke[dc, CirclePath, TRUE];
};
};

CircleTransform: PROC [slice: Slice, parts: SliceParts, transform: ImagerTransformation.Transformation] = {
isOrigin: BOOL _ FALSE;
cpCount: INT _ 0;
cpIndex: INT _ -1;
originPoint, edgePoint, pointInUnitSpace: Point;
circleData: CircleData _ NARROW[slice.data];
circleParts: CircleParts _ NARROW[parts];
IF circleParts.cpArray[0] THEN isOrigin _ TRUE;
FOR index: CirclePoints IN [1..MaxCirclePoints) DO
IF circleParts.cpArray[index] THEN{ 
cpCount _ cpCount + 1;
cpIndex _ index;
};
ENDLOOP;
IF isOrigin OR cpCount > 1 THEN {  -- treat as though complete circle is selected
circleData.transform _ ImagerTransformation.Concat[circleData.transform, transform];
circleData.scale _ ImagerTransformation.SingularValues[circleData.transform];
circleData.inverse _ ImagerTransformation.Invert[circleData.transform];
circleData.inverseScale _ ImagerTransformation.SingularValues[circleData.inverse];
CircleSetBoundBox[slice];
RETURN;
}; 
originPoint _ ImagerTransformation.Transform[circleData.transform, [0.0, 0.0]];
IF cpCount = 0 AND NOT isOrigin THEN {
edgePoint _ GGVector.Add[v1: GGVector.Sub[v1: circleData.startPoint, v2: originPoint], v2: ImagerTransformation.Factor[transform].t]; -- edgepoint relative to origin
edgePoint _ GGVector.Add[originPoint, edgePoint]; -- make edgepoint absolute

}
ELSE { -- this is the normal case when a single CP is selected
edgePoint _ ImagerTransformation.Transform[circleData.transform, SELECT cpIndex FROM
1 => [-1.0, 0.0],
2 => [0.0, 1.0],
3 => [1.0, 0.0],
4 => [0.0, -1.0],
ENDCASE => ERROR];
edgePoint _ ImagerTransformation.Transform[transform, edgePoint]; -- move the edgepoint
};
pointInUnitSpace _ ImagerTransformation.Transform[circleData.inverse, edgePoint];
circleData.transform _ ImagerTransformation.PreScale[circleData.transform, MAX[GGVector.Magnitude[pointInUnitSpace], 0.01] ]; -- circles can't shrink to zero
circleData.scale _ ImagerTransformation.SingularValues[circleData.transform];
circleData.inverse _ ImagerTransformation.Invert[circleData.transform];
circleData.inverseScale _ ImagerTransformation.SingularValues[circleData.inverse];
CircleSetBoundBox[slice];
};

CircleDescribe: PROC [slice: Slice, parts: SliceParts] RETURNS [rope: Rope.ROPE] = {
prefix: Rope.ROPE;
cpCount: INT _ 0;
circleParts: CircleParts _ NARROW[parts];
FOR index: CirclePoints IN [0..MaxCirclePoints) DO
IF circleParts.cpArray[index] THEN cpCount _ cpCount + 1;
ENDLOOP;
IF cpCount > 1 THEN RETURN[ "multiple parts of a Circle slice"];
IF cpCount=0 THEN prefix _ IF circleParts.outline THEN "outline" ELSE "nowhere"
ELSE prefix _ IF circleParts.cpArray[0] THEN "origin" ELSE "circumference point";
rope _ Rope.Concat[prefix, " of a Circle slice"];
};

CircleFileout: PROC [slice: Slice, f: IO.STREAM] = {
circleData: CircleData _ NARROW[slice.data];
GGParseOut.WriteTransformation[f, circleData.transform];
f.PutRope[" strokeWidth: "];
f.PutF["%g", [real[circleData.strokeWidth]] ];
f.PutRope[" strokeColor: "];
GGParseOut.WriteColor[f, circleData.strokeColor];
f.PutRope[" fillColor: "];
GGParseOut.WriteColor[f, circleData.fillColor];
f.PutChar[IO.SP];
};
CircleFilein: PROC [f: IO.STREAM, version: REAL, feedback: Viewer] RETURNS [slice: Slice] = {
circleData: CircleData;
origin, outerPoint: Point;
transform: ImagerTransformation.Transformation;
strokeWidth: REAL;
strokeColor, fillColor: Imager.Color;
GGParseIn.ReadBlank[f];
transform _ GGParseIn.ReadTransformation[f];
origin _ ImagerTransformation.Transform[m: transform, v: [0.0, 0.0] ];
outerPoint _ ImagerTransformation.Transform[m: transform, v: [0.0, 1.0] ];
GGParseIn.ReadBlankAndRope[f, "strokeWidth:"];
strokeWidth _ GGParseIn.ReadBlankAndReal[f];
GGParseIn.ReadBlankAndRope[f, "strokeColor:"];
GGParseIn.ReadBlank[f];
strokeColor _ GGParseIn.ReadColor[f];
GGParseIn.ReadBlankAndRope[f, "fillColor:"];
GGParseIn.ReadBlank[f];
fillColor _ GGParseIn.ReadColor[f];
slice _ MakeCircleSlice[origin, outerPoint, strokeWidth, strokeColor, fillColor].slice;
circleData _ NARROW[slice.data];
circleData.transform _ transform;
circleData.scale _ ImagerTransformation.SingularValues[circleData.transform];
circleData.inverse _ ImagerTransformation.Invert[circleData.transform];
circleData.inverseScale _ ImagerTransformation.SingularValues[circleData.inverse];
CircleSetBoundBox[slice];
};
CircleEmptyParts: PROC [slice: Slice, parts: SliceParts] RETURNS [BOOL] = {
circleParts: CircleParts _ NARROW[parts];
RETURN[IsEmpty[circleParts] ]; 
};

NearestCirclePoint: PROC [slice: Slice, point: Point] RETURNS [index: [0..4] ] = {
sliceParts: SliceParts _ CircleNewParts[slice, NIL, slice];
circleHitData: CircleHitData;
success: BOOL;
hitData: REF ANY;
sliceD: SliceDescriptor _ NEW[SliceDescriptorObj _ [slice, sliceParts]];
[----, ----, hitData, success] _ CircleClosestPoint[sliceD: sliceD, testPoint: point, tolerance: GGUtility.plusInfinity];
IF NOT success THEN ERROR;
circleHitData _ NARROW[hitData];
index _ circleHitData.index;
IF index = -1 THEN ERROR;
};

CircleNewParts: PROC [slice: Slice, hitData: REF ANY, mode: SelectMode] RETURNS [parts: SliceParts] = {
circleHitData: CircleHitData _ NARROW[hitData];
circleParts: CircleParts _ NEW[CirclePartsObj _ [ALL[FALSE], FALSE] ];
SELECT mode FROM
joint => {
IF circleHitData.index#-1 THEN circleParts.cpArray[circleHitData.index] _ TRUE
ELSE IF circleHitData.outline THEN {
index: [-1..4] _ NearestCirclePoint[slice, circleHitData.hitPoint];
circleParts.cpArray[index] _ TRUE;
};
};
controlPoint => circleParts.cpArray _ ALL[TRUE];
segment, traj, topLevel, slice => MakeComplete[circleParts];
none => {
IF circleHitData.index#-1 THEN circleParts.cpArray[circleHitData.index] _ TRUE;
IF circleHitData.outline THEN circleParts.outline _ TRUE;
};
ENDCASE => ERROR;
parts _ circleParts; -- RETURN[boxParts]
};

CircleUnionParts: PROC [slice: Slice, partsA: SliceParts, partsB: SliceParts] RETURNS [aPlusB: SliceParts] = {
circlePartsA: CircleParts _ NARROW[partsA];
circlePartsB: CircleParts _ NARROW[partsB];
newParts: CircleParts _ NEW[CirclePartsObj _ [ALL[FALSE], FALSE ] ];
FOR i: CirclePoints IN CirclePoints DO
newParts.cpArray[i] _ circlePartsA.cpArray[i] OR circlePartsB.cpArray[i];
ENDLOOP;
newParts.outline _ circlePartsA.outline OR circlePartsB.outline;
aPlusB _ newParts; -- RETURN[newParts]
};

CircleDiffParts: PROC [slice: Slice, partsA: SliceParts, partsB: SliceParts] RETURNS [aMinusB: SliceParts] = {
circlePartsA: CircleParts _ NARROW[partsA];
circlePartsB: CircleParts _ NARROW[partsB];
newParts: CircleParts _ NEW[CirclePartsObj _ [ALL[FALSE], FALSE ] ];
FOR i: CirclePoints IN CirclePoints DO
newParts.cpArray[i] _ IF circlePartsB.cpArray[i] THEN FALSE ELSE circlePartsA.cpArray[i];
ENDLOOP;
newParts.outline _ IF circlePartsB.outline THEN FALSE ELSE circlePartsA.outline;
aMinusB _ newParts; -- RETURN[newParts]
};

CircleMovingParts: PROC [slice: Slice, parts: SliceParts] RETURNS [moving: SliceParts] = {
circleParts: CircleParts _ NARROW[parts];
newParts: CircleParts _ NEW[CirclePartsObj _ [ALL[FALSE], FALSE] ];
IF circleParts.cpArray[0] THEN {
newParts.cpArray _ ALL[TRUE];
newParts.outline _ TRUE;
}
ELSE FOR i: INTEGER IN [1..4] DO
IF circleParts.cpArray[i] THEN {
newParts.cpArray _ ALL[TRUE];
newParts.cpArray[0] _ FALSE;
newParts.outline _ TRUE;
EXIT;
};
ENDLOOP;
moving _ newParts; -- RETURN[newParts]
};

CircleFixedParts: PROC [slice: Slice, parts: SliceParts, selectedList: LIST OF REF ANY] RETURNS [fixed: SliceParts] = {
moving: SliceParts _ CircleMovingParts[slice, parts];
allParts: CircleParts _ NEW[CirclePartsObj];
MakeComplete[allParts];
fixed _ CircleDiffParts[slice, allParts, moving];
};

CircleAugmentParts: PROC [slice: Slice, parts: SliceParts, selectClass: SelectionClass] RETURNS [more: SliceParts] = {
more _ parts;
};
CirclePointsInDescriptor: PROC [sliceD: SliceDescriptor] RETURNS [pointGen: PointGenerator] = {
parts: CircleParts _ NARROW[sliceD.parts];
pointGen _ NEW[PointGeneratorObj _ [sliceD, 0, 0, NIL] ];
FOR index: CirclePoints IN CirclePoints DO
IF parts.cpArray[index] THEN pointGen.toGo _ pointGen.toGo + 1;
ENDLOOP; 
};

CircleNextPoint: PROC [pointGen: PointGenerator] RETURNS [pointAndDone: GGModelTypes.PointAndDone] = {
sliceD: SliceDescriptor _ pointGen.sliceD;
slice: Slice _ sliceD.slice;
circleData: CircleData _ NARROW[slice.data];
t: ImagerTransformation.Transformation _ circleData.transform;
IF pointGen=NIL OR pointGen.toGo = 0 THEN {
pointAndDone.done _ TRUE;
RETURN;
}
ELSE {
parts: CircleParts _ NARROW[sliceD.parts];
index: NAT;
pointAndDone.done _ FALSE;
FOR index _ pointGen.index, index+1 UNTIL index>=LAST[CirclePoints] DO
IF parts.cpArray[index] THEN EXIT; -- find the next included point
ENDLOOP;
SELECT index FROM
0 => pointAndDone.point _ ImagerTransformation.Transform[t, [0.0, 0.0]]; -- origin
1 => pointAndDone.point _ ImagerTransformation.Transform[t, [-1.0, 0.0]]; -- left
2 => pointAndDone.point _ ImagerTransformation.Transform[t, [0.0, 1.0]]; -- top
3 => pointAndDone.point _ ImagerTransformation.Transform[t, [1.0, 0.0]]; -- right
4 => pointAndDone.point _ ImagerTransformation.Transform[t, [0.0, -1.0]]; -- bottom
ENDCASE => SIGNAL GGError.Problem[msg: "Broken Invariant"];
pointGen.index _ index+1;
pointGen.toGo _ pointGen.toGo - 1;
};
};

CircleClosestPoint: PROC [sliceD: SliceDescriptor, testPoint: Point, tolerance: REAL] RETURNS [bestPoint: Point, bestDist: REAL, hitData: REF ANY, success: BOOL _ FALSE] = {
sliceBBox: BoundBox _ sliceD.slice.boundBox;
toleranceBox: GGBasicTypes.BoundBoxObj _ [sliceBBox.loX-tolerance, sliceBBox.loY-tolerance, sliceBBox.hiX+tolerance, sliceBBox.hiY+tolerance, FALSE, FALSE]; -- box in GG coordinates
IF PointIsInBox[testPoint, toleranceBox] THEN {
nextPoint, origin, left, top, right, bottom: Point; -- points in Gargoyle coordinates
nextDist2, bestDist2: REAL _ GGUtility.plusInfinity;
tolerance2: REAL _ tolerance*tolerance;
foundIndex: INTEGER _ 0;
circleData: CircleData _ NARROW[sliceD.slice.data];
circleHitData: CircleHitData;
[origin, left, top, right, bottom] _ CirclePointsFromData[circleData];
FOR index: INTEGER IN [0..MaxCirclePoints) DO
nextPoint _ SELECT index FROM
0 => origin, 1 => left, 2 => top, 3 => right, 4 => bottom,
ENDCASE => ERROR;
nextDist2 _ GGVector.DistanceSquared[testPoint, nextPoint];
IF nextDist2 < bestDist2 THEN {
bestDist2 _ nextDist2;
foundIndex _ index;
bestPoint _ nextPoint;
IF bestDist2 < tolerance2 THEN success _ TRUE;
};
ENDLOOP;
IF success THEN {
hitData _ circleHitData _ NEW[CircleHitDataObj _ [index: foundIndex, hitPoint: bestPoint, outline: FALSE] ];
bestDist _ RealFns.SqRt[bestDist2];
};
};
};

CircleClosestSegment: PROC [sliceD: SliceDescriptor, testPoint: Point, tolerance: REAL] RETURNS [bestPoint: Point, bestDist: REAL, hitData: REF ANY, success: BOOL _ FALSE] = {
sliceBBox: BoundBox _ sliceD.slice.boundBox;
toleranceBox: GGBasicTypes.BoundBoxObj _ [sliceBBox.loX-tolerance, sliceBBox.loY-tolerance, sliceBBox.hiX+tolerance, sliceBBox.hiY+tolerance, FALSE, FALSE]; -- box in GG coordinates
IF PointIsInBox[testPoint, toleranceBox] THEN {
circleHitData: CircleHitData;
circleData: CircleData _ NARROW[sliceD.slice.data];
pointOnCircle: Point _ [0.0, 0.0];
localTestpoint: Point _ ImagerTransformation.Transform[circleData.inverse, testPoint];
dist: REAL _ GGVector.Magnitude[localTestpoint];
IF dist > 0.0 THEN pointOnCircle _ GGVector.Scale[localTestpoint, 1.0/dist];
bestPoint _ ImagerTransformation.Transform[circleData.transform, pointOnCircle];
bestDist _ GGVector.Distance[testPoint, bestPoint];
IF bestDist<tolerance THEN {
hitData _ circleHitData _ NEW[CircleHitDataObj _ [index: -1, hitPoint: bestPoint, outline: TRUE] ];
success _ TRUE;
};
};
};

CircleLineIntersection: PUBLIC PROC [sliceD: SliceDescriptor, line: Line] RETURNS [points: LIST OF Point, pointCount: NAT] = {
circleData: CircleData _ NARROW[sliceD.slice.data];
circleParts: CircleParts _ NARROW[sliceD.parts];
epsilon: REAL = 0.072;
localLine: Line _ GGLines.LineTransform[line, circleData.inverse];
localPoints: ARRAY [1..2] OF Point;
[localPoints, pointCount] _ GGCircles.CircleMeetsLine[circleData.circle, localLine];
points _ NIL;
FOR i: NAT IN [1..pointCount] DO
points _ CONS[ImagerTransformation.Transform[m: circleData.transform, v: localPoints[i]], points];
ENDLOOP;
};

CircleHitDataAsSimpleCurve: PROC [slice: Slice, hitData: REF ANY] RETURNS [simpleCurve: REF ANY] = {
circleHitData: CircleHitData _ NARROW[hitData];
circleData: CircleData _ NARROW[slice.data];
IF NOT circleHitData.outline THEN RETURN[NIL];
IF NOT circleData.evenScaling THEN RETURN[NIL];
simpleCurve _ circleData.simpleCircle;
};

PointIsInBox: PRIVATE PROC [test: Point, box: GGBasicTypes.BoundBoxObj] RETURNS [BOOL] = {
RETURN[ NOT (test.x < box.loX OR test.x > box.hiX OR test.y < box.loY OR test.y > box.hiY) ];
};

CirclePointsFromData: PROC [circleData: CircleData] RETURNS [origin, left, top, right, bottom: Point] = {
t: ImagerTransformation.Transformation _ circleData.transform;
origin _ ImagerTransformation.Transform[t, [0.0, 0.0] ];
left _ ImagerTransformation.Transform[t, [-1.0, 0.0] ];
top _ ImagerTransformation.Transform[t, [0.0, 1.0] ];
right _ ImagerTransformation.Transform[t, [1.0, 0.0] ];
bottom _ ImagerTransformation.Transform[t, [0.0, -1.0] ];
};


CircleSetStrokeWidth: PROC [slice: Slice, parts: SliceParts, strokeWidth: REAL] = {
circleData: CircleData _ NARROW[slice.data];
circleData.strokeWidth _ strokeWidth;
CircleSetBoundBox[slice];
};

CircleGetStrokeWidth: PROC [slice: Slice, parts: SliceParts] RETURNS [strokeWidth: REAL] = {
circleData: CircleData _ NARROW[slice.data];
strokeWidth _ circleData.strokeWidth;
};

CircleSetStrokeColor: PROC [slice: Slice, parts: SliceParts, color: Imager.Color] = {
circleData: CircleData _ NARROW[slice.data];
circleData.strokeColor _ color;
};

CircleGetStrokeColor: PROC [slice: Slice, parts: SliceParts] RETURNS [color: Imager.Color] = {
circleData: CircleData _ NARROW[slice.data];
color _ circleData.strokeColor;
};

CircleSetFillColor: PROC [slice: Slice, color: Imager.Color] = {
circleData: CircleData _ NARROW[slice.data];
circleData.fillColor _ color;
};

CircleGetFillColor: PROC [slice: Slice] RETURNS [color: Imager.Color] = {
circleData: CircleData _ NARROW[slice.data];
color _ circleData.fillColor;
};

FetchSliceClass: PUBLIC PROC [type: ATOM] RETURNS [class: SliceClass] = {
FOR l: LIST OF SliceClassDef _ sliceClasses, l.rest UNTIL l=NIL DO
IF l.first.type=type THEN RETURN[l.first.class];
ENDLOOP;
SIGNAL GGError.Problem[msg: "Slice class not found."];
RETURN[NIL];
};

RegisterSliceClass: PUBLIC PROC [class: SliceClass] = {
classDef: SliceClassDef _ NEW[SliceClassDefObj _ [type: class.type, class: class]];
sliceClasses _ CONS[classDef, sliceClasses];
};

DeleteSlice: PUBLIC PROC [scene: Scene, slice: Slice] =  {
GGObjects.DeleteEntity[scene, slice];
};

CopySlice: PUBLIC PROC [slice: Slice] RETURNS [copy: Slice] = {
RETURN[slice.class.copy[slice]];
};

Init: PROC [] = {
textDef: SliceClassDef _ NEW[SliceClassDefObj _ [type: $Text, class: GGSlice.BuildTextSliceClass[]]];
ipDef: SliceClassDef _ NEW[SliceClassDefObj _ [type: $IP, class: GGSlice.BuildIPSliceClass[]]];
boxDef: SliceClassDef _ NEW[SliceClassDefObj _ [type: $Box, class: GGSlice.BuildBoxSliceClass[]]];
circleDef: SliceClassDef _ NEW[SliceClassDefObj _ [type: $Circle, class: GGSlice.BuildCircleSliceClass[]]];
sliceClasses _ LIST[circleDef, boxDef, ipDef, textDef];

printPrefix _ Atom.MakeAtom["xerox/pressfonts/"];
screenPrefix _Atom.MakeAtom ["xerox/tiogafonts/"];

globalEdge _ GGLines.CreateEmptyEdge[];
};

sliceClasses: LIST OF SliceClassDef;
printPrefix: ATOM;
screenPrefix: ATOM;

Init[];

END.
ΐGGSliceImplA.mesa
Copyright c 1986 by Xerox Corporation.  All rights reserved.
Last edited by Pier on January 15, 1987 2:22:23 pm PST
Last edited by Bier on January 15, 1987 1:21:28 am PST
Contents:  Implements various slice classes in Gargoyle.

Box Slice Class
Fundamentals
Drawing
Transforming
Textual Description
Parts
Part Generators
Hit Testing
Style
requires a bound box input with loX<=hiX AND loY<=hiY
Class Procedures
GGModelTypes.SliceBoundBoxProc
GGModelTypes.SliceBoundBoxProc
GGModelTypes.SliceCopyProc
GGModelTypes.SliceDrawPartsProc
draw fill
draw outline
Imager.SetStrokeJoint[dc, round];
Imager.SetStrokeEnd[dc, round];
GGModelTypes.SliceDrawSelectionFeedbackProc
draw fill
draw outline
Imager.SetStrokeJoint[dc, round];
Imager.SetStrokeEnd[dc, round];
draw control points
IF camera.quality#quality AND drawCPs THEN {
GGShapes.DrawCP[dc, ll ];
GGShapes.DrawCP[dc, ul ];
GGShapes.DrawCP[dc, ur ];
GGShapes.DrawCP[dc, lr ];
GGShapes.DrawCP[dc, GGVector.Scale[GGVector.Add[ll, ur], 0.5] ];
};
GGModelTypes.SliceDrawTransformProc
This is what makes boxes behave specially. Depending on which parts are selected, the points are transformed and the box is rubberbanded properly.  The box data itself is not modified.
total transformation has already occurred on point, oppositePoint
More than one edge or more than two corners. Full transform.
GGModelTypes.SliceTransformProc
Permanently transforms the box. Depending on which parts are selected, the points are transformed and the box is grown/shrunk properly.
GGModelTypes.SliceEmptyPartsProc
GGModelTypes.SliceNewPartsProc
GGModelTypes.SliceUnionPartsProc
GGModelTypes.SliceMovingPartsProc
If anything other than only one corner or only one edge is moving, everything is moving
If only one corner is moving, everything except its opposite corner is moving
If only one edge is moving, everything excepts its opposite edge and the opposite edge corners are moving.
GGModelTypes.SliceFixedPartsProc
Start with every part and remove the ones that are moving
GGModelTypes.SliceAugmentPartsProc
For every edge, add its corresponding corners
GGModelTypes.SliceClosestPointProc
hitData _ NIL;  -- automatically done by compiler
GGModelTypes.SliceClosestSegmentProc
hitData _ NIL;  -- automatically done by compiler
Find the intersections of the given line with bBox.  pointCount will be at most 2.
GGModelTypes.SliceDescribeProc
GGModelTypes.SliceFileoutProc
Write a description of yourself onto stream f.
GGModelTypes.SliceFileinProc

Circle Slice Class
transform needed for general case of rotated circles
cpArray[origin, left, top, right, bottom]. 5 element array.
Fundamentals
Drawing
Transforming
Textual Description
Hit Testing
Style
Class Procedures

Fundamentals
GGModelTypes.SliceBoundBoxProc
GGModelTypes.SliceBoundBoxProc
since the circle can be an ellipse, we just can't find the radius.
GGModelTypes.SliceCopyProc
copy transform and inverse to the new structure (interface to makecircle requires origin and radius, which is inadequate since "circle" could actually have been transformed into an ellipse.  Thus we passed a meaningless origin and radius).

Drawing
GGModelTypes.SliceDrawPartsProc
GGModelTypes.SliceDrawSelectionFeedbackProc
GGModelTypes.SliceDrawTransformProc
This is what makes circles behave specially. Depending on which parts are selected, the points are transformed and the circle is rubberbanded properly.  The circle data itself is not modified.
Only one cp is selected OR no selections for a brand new circle.  Only rubberband radius
This is the special case of a new circle being rubberbanded
Circles can only be shrunk by a factor of 100 per scaling operation.
called with the dc transformation already set to object coordinates
DOES NOT USE DoSaveAll !!

Transforming
GGModelTypes.SliceTransformProc
Permanently transforms the circle. Depending on which parts are selected, the circle is transformed.
Only one cp is selected OR no selections for a brand new circle
This is the special case of a new circle being rubberbanded

Textual Description
GGModelTypes.SliceDescribeProc
GGModelTypes.SliceFileoutProc
Write a description of yourself onto stream f.

GGModelTypes.SliceFileinProc
fix up the new circle transforms in case they were skewed by uneven scaling

Hit Testing
GGModelTypes.SliceEmptyPartsProc
GGModelTypes.SliceNewPartsProc
GGModelTypes.SliceUnionPartsProc
GGModelTypes.SliceDifferencePartsProc
GGModelTypes.SliceMovingPartsProc
If center is moving, everything moves.  If any edge CP is moving, its fellow edge CP are moving
GGModelTypes.SliceFixedPartsProc
Start with every part and remove the ones that are moving
GGModelTypes.SliceAugmentPartsProc
DOESN'T DO A COPY. MAYBE IT SHOULD
GGModelTypes.SliceClosestPointProc
hitData _ NIL;  -- automatically done by compiler
GGModelTypes.SliceClosestSegmentProc
hitData _ NIL;  -- automatically done by compiler
Find hit point on unit circle
Transform back to world coords
Style
Class registration

scene.ptrValid _ FALSE;
scene.entities _ GGUtility.DeleteEntityFromList[slice, scene.entities];
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